The Affordable Care Act (ACA) includes many changes to the health care systemsome implemented as early as 2010 (e.g., allowing children to stay on a parent's health insurance plan until age 26), others to be implemented much later. Of particular relevance to the coverage provisions of the law are the rollout of the Marketplaces, which began in October 2013 with coverage starting in January 2014; the Medicaid expansion taking effect in January 2014 in those states that choose to expand eligibility; and the mandate on individuals to buy insurance beginning in 2014. This brief focuses on knowledge of the ACA coverage provisions among nonelderly adults overall and among those most likely to be affected by the different provisions of the law.

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